Channel balance part number

A quick learner from Miami, florida says:
August 3, 2017
Replacement channel balance for Lawson window part# 29DS 42

385 seems to be the one I need, has the correct shoe length, need the spring weight.

Thanks,
Gary
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Tom from SWISCO responded:
August 4, 2017
Hey, Gary. Thanks for contacting us. I recommend weighing your sash on a scale to confirm the best option. Based on your stamp, your sash may be 42 pounds, in which case either our 2970 or 2975 could work. The 2970 can carry sashes weighing 39 through 42 pounds, and the 2975 can carry 42 through 45 pounds. I would get the exact weight of the sash to be sure.
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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